Iran faces a looming environmental crisis, from drought to poor water quality to chronic pollution. According to experts, some regions even risk becoming uninhabitable – they blame mismanagement. Others say the return of sanctions could accelerate the crisis. In 2018, a team of prominent conservationists were jailed. They've been accused of spying and various national security crimes. Kaveh Madani, an Iranian scientist and former deputy head of Iran's Department of Environment, tells us more.